/**
 * Copyright (c) 2010, Bjorn Roche
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the XO Audio, LLC nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
**/
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleActivator;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import org.osgi.framework.ServiceListener;
import org.osgi.framework.ServiceEvent;

import java.lang.reflect.Method;

/*
 * This class implements a simple OSGi service that runs the static main
 * function on the given class when started. It is assumed that the service is
 * never stopped. Note that ServiceListener is implemented but not used.
**/
public class Activator implements BundleActivator, ServiceListener
{
    /**
     * Implements BundleActivator.start(). Prints
     * a message and adds itself to the bundle context as a service
     * listener.
     * @param context the framework context for the bundle.
    **/
    public void start(final BundleContext context)
    {
	//System.out.println( "------------ ACTIVATOR --------------" );
        context.addServiceListener(this);
        new Thread() { //Put this in a seperate thread due to FELIX bug 1812
           public void run() {
              try {
                 String mainClass=context.getProperty("com.xonami.piecemeal.mainClass");
                 int argCount=0;
                 while( context.getProperty("com.xonami.piecemeal.arg["+argCount+"]") != null )
                   ++argCount;
                 String args[] = new String[ argCount ];
                 for( int i=0; i<argCount; ++i )
                    args[i] = context.getProperty("com.xonami.piecemeal.arg["+i+"]");

                 Class c = Class.forName( mainClass );
                 Method m = c.getMethod( "main", new Class[] { String[].class } ); 
                 Object ret = m.invoke( null, new Object[] { args } );
                 if( ret instanceof Integer )
                    System.exit( ((Integer)ret).intValue() );
              } catch( Exception e ) {
                 System.out.println( e );
                 System.exit(0);
              }
           }
        }.start();
    }

    /**
     * Implements BundleActivator.stop(). Prints
     * a message and removes itself from the bundle context as a
     * service listener.
     * @param context the framework context for the bundle.
    **/
    public void stop(BundleContext context)
    {
        context.removeServiceListener(this);
        // Note: It is not required that we remove the listener here,
        // since the framework will do it automatically anyway.
    }

    /**
     * Implements ServiceListener.serviceChanged().
     * @param event the fired service event.
    **/
    public void serviceChanged(ServiceEvent event)
    {
        String[] objectClass = (String[])
            event.getServiceReference().getProperty("objectClass");

        switch( event.getType() ) {
        case ServiceEvent.REGISTERED:
           break;
        case ServiceEvent.UNREGISTERING:
           break;
        case ServiceEvent.MODIFIED:
           break;
        }
    }
}
